Notification received by Plesk administrator regarding WordPress site: Failed to reset cache for the instance: filemng: No such file or directory

Anton Kuznetsov

Updated January 13, 2026 19:00

Plesk for Windows Plesk for Linux kb: technical ext: wptk ABT: Group B

Applicable to:

Plesk for Linux
Plesk for Windows

Symptoms

Daily email "WordPress Updates Digest" is received that contains the following:

CONFIG_TEXT: Website "/httpdocs.old/blog" (example.com): Failed to reset cache for the instance #19: filemng: Failed to change directory to /var/www/vhosts/example.com/httpdocs.old/blog: No such file or directory
The instance for example.com exists in WP Toolkit and is not broken.
Records in WP Toolkit database show, that two instances exist for domain example.com (the same domainId with different directories):

# sqlite3 /usr/local/psa/var/modules/wp-toolkit/wp-toolkit.sqlite3
sqlite> .mode columns
sqlite> .headers on
sqlite> select * from instances;
id domainId path isIgnored apsInstanceId serverId guid
18 88 /httpdocs 0 a950f380-79da-4095-afdd-862e1b9e7784
19 88 /httpdocs.old/blog 0 0cd165cd-6777-4e01-96c7-dddeca145281

Cause

The folder /var/www/vhosts/example.com/httpdocs.old is removed manually or all the files were moved to another directory /var/www/vhosts/example.com/httpdocs.

As a result, WordPress database has not been updated with information about this change.

Resolution

Click on a section to expand

Via Plesk interface

Log into Plesk.
Go to the old instance in WP Toolkit and detach it:

Click on a section to expand

Via SSH access

Connect to the server via SSH / via RDP.

Note: If direct SSH/RDP access to the server is not possible, contact server administrator for further assistance.
Detach the old instance using the command below with the actual instance ID:

# plesk ext wp-toolkit --detach -instance-id 19

If the above actions did not help, follow the steps below:

Click on a section to expand

Linux

Connect to the server via SSH;
Create a backup of WP Toolkit database:

# cp -p /usr/local/psa/var/modules/wp-toolkit/wp-toolkit.sqlite3{,.backup}
Remove leftovers of affected instance from WP Toolkit database:

# sqlite3 /usr/local/psa/var/modules/wp-toolkit/wp-toolkit.sqlite3
sqlite> DELETE FROM InstanceProperties WHERE instanceId=19;
sqlite> DELETE FROM InstancesDomains WHERE instanceId=19;
sqlite> DELETE FROM Instances where id=19;
sqlite> .quit

Click on a section to expand

Windows

Connect to the server via RDP;
Create a dump of the Plesk database:
C:\> plesk db dump > "C:\psa_dump.sql"
Download sqlite3.exe from this link into C:\temp\
Create copy of WP Toolkit database, located in %plesk_dir%var\modules\wp-toolkit\wp-toolkit.sqlite3
Open Command Prompt as Administrator and execute the following command and log in WP Toolkit database:

C:\> "C:\temp\sqlite3.exe" "%plesk_dir%var\modules\wp-toolkit\wp-toolkit.sqlite3"
Remove leftovers of affected instance from WP Toolkit database:

C:\> sqlite> DELETE FROM InstanceProperties WHERE instanceId=19;
sqlite> DELETE FROM InstancesDomains WHERE instanceId=19;
sqlite> DELETE FROM Instances where id=567; sqlite> .quit

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